6-75914987-C-T

Variant names:

• chr6-75914987-C-T
• rs397517052
• NM_004999.4:c.3833C>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_004999.4(MYO6):​c.3833C>T​(p.Ala1278Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,052 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MYO6 NM_004999.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.54
• Publications: 0 publications found

Genes affected

MYO6 (HGNC:7605): (myosin VI) This gene encodes a reverse-direction motor protein that moves toward the minus end of actin filaments and plays a role in intracellular vesicle and organelle transport. The protein consists of a motor domain containing an ATP- and an actin-binding site and a globular tail which interacts with other proteins. This protein maintains the structural integrity of inner ear hair cells and mutations in this gene cause non-syndromic autosomal dominant and recessive hearing loss. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2014]

MYO6 Gene-Disease associations (from GenCC):

• autosomal dominant nonsyndromic hearing loss 22

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia
• nonsyndromic genetic hearing loss

  Inheritance: AD, AR Classification: DEFINITIVE, MODERATE Submitted by: ClinGen, G2P
• autosomal recessive nonsyndromic hearing loss 37

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• progressive sensorineural hearing loss-hypertrophic cardiomyopathy syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004999.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYO6	NM_004999.4	MANE Select	c.3833C>T	p.Ala1278Val	missense	Exon 35 of 35	NP_004990.3
	MYO6	NM_001368865.1		c.3860C>T	p.Ala1287Val	missense	Exon 36 of 36	NP_001355794.1
	MYO6	NM_001368866.1		c.3833C>T	p.Ala1278Val	missense	Exon 35 of 35	NP_001355795.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYO6	ENST00000369977.8	TSL:1 MANE Select	c.3833C>T	p.Ala1278Val	missense	Exon 35 of 35	ENSP00000358994.3
	MYO6	ENST00000615563.4	TSL:1	c.3764C>T	p.Ala1255Val	missense	Exon 32 of 32	ENSP00000478013.1
	MYO6	ENST00000664640.1		c.3860C>T	p.Ala1287Val	missense	Exon 36 of 36	ENSP00000499278.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461052 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726798

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44674

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86176

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53360

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5388

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111868

Other (OTH) AF: 0.00 AC: 0 AN: 60322

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

May 14, 2012

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Ala1278Val variant (MYO6) has not been reported in the literature nor previo usly identified by our laboratory. Computational analyses (biochemical amino aci d properties, conservation, AlignGVGD, PolyPhen2, and SIFT) do not provide stron g support for or against an impact to the protein. Additional information is nee ded to fully assess the clinical significance of the Ala1278Val variant.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.37
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.16	T
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.086	D
MetaRNN	Uncertain	0.53	D
MetaSVM	Uncertain	0.62	D
PhyloP100		7.5
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.86	N
REVEL	Uncertain	0.51
Sift	Benign	0.049	D
Sift4G	Uncertain	0.030	D
Polyphen		1.0	D
Vest4		0.64
MVP		0.92
MPC		0.93
ClinPred		0.78	D
GERP RS		6.1
gMVP		0.63
Mutation Taster		=27/73	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs397517052; hg19: chr6-76624704;